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    The cable shield currents and ground voltage differences are caused by several mechanisms. The second most common source of hum and buzz is the voltage difference between two safety grounds separated by a large distance or the voltage difference between a safety ground and an "Earth" ground (such as a grounded satellite dish or cable TV source).

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    The conventional blasting rock excavation method is the main means of rock breakage because of its high productivity, and it is relatively inexpensive compared to other methods.

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    A Sweden smelting plant called “Rönnskär” did an analysis report about the contains of the scrap computer circuit board. The metals contains can reach 49% high. Also, the scrap cellphone circuit board contains over 6 kinds of valuable metals as gold, silver, palladium, platinum, copper, tin, etc. The rate of each metals are as below Au

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    A Sweden smelting plant called “Rönnskär” did an analysis report about the contains of the scrap computer circuit board. The metals contains can reach 49% high. Also, the scrap cellphone circuit board contains over 6 kinds of valuable metals as gold, silver, palladium, platinum, copper, tin, etc. The rate of each metals are as below Au

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